In Newquay the lifeboat crew are called one of the many ship wrecks lying on the sea bed off the Cornish coast, where a diver has been found unconscious without his mouthpiece over 30 metres under the waves. In one of the busiest shipping lanes in the world, the Dover Strait, a yacht taking on water calls for help. The crew of the Dover lifeboat race to reach them before they sink or are hit by one of the large cargo ships racing through the Channel. Meanwhile in Mudeford on the Dorset coast the crew and their lifeboat are pushed to their limits as they launch into storm conditions to search for a windsurfer in trouble.